"That the major political parties have decisively changed positions on abortion is clear. On the eve of Roe, as we have noted, the Gallup Poll reported that a sizeable majority of all Americans—by 64% to 31%—agreed with the statement that “the decision to have an abortion should be made solely by a woman and her physician”; 68% of Republicans supported that categorical statement compared with 58% of Democrats. Today, of course, it is the Republican Party that opposes constitutional protections for abortion, and the Democratic Party that supports them."